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參數(shù)資料
| 型號： | LTC1628 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 射頻放大器 |
| 文件頁數(shù)： | 8/32頁 |
| 文件大小： | 366K |
| 代理商： | LTC1628 |
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8
LTC1628/LTC1628-PG
RUN/SS1, RUN/SS2 (Pins 1, 15):
Combination of soft-
start, run control inputs and short-circuit detection timers.
A capacitor to ground at each of these pins sets the ramp
time to full output current. Forcing either of these pins
back below 1.0V causes the IC to shut down the circuitry
required for that particular controller. Latchoff overcurrent
protection is also invoked via this pin as described in the
Applications Information section.
SENSE1
+
, SENSE2
+
(Pins 2, 14):
The (+) Input to the
Differential Current Comparators. The I
th
pin voltage and
controlled offsets between the SENSE
–
and SENSE
+
pins
in conjunction with R
SENSE
set the current trip threshold.
SENSE1
–
, SENSE2
–
(Pins 3, 13):
The (–) Input to the
Differential Current Comparators.
V
OSENSE1
, V
OSENSE2
(Pins 4, 12):
Receives the remotely-
sensed feedback voltage for each controller from an
external resistive divider across the output.
FREQSET (Pin 5):
Frequency Control Input to the Oscilla-
tor. This pin can be left open, tied to ground, tied to INTV
CC
or driven by an external voltage source. This pin can also
be used with an external phase detector to build a true
phase-locked loop.
STBYMD (Pin 6):
Control pin that determines which cir-
cuitry remains active when the controllers are shut down
and/or provides a common control point to shut down
both controllers. See the Operation section for details.
FCB (Pin 7):
Forced Continuous Control Input. This input
acts on the first controller (or both controllers depending
upon the FLTCPL pin—see pin description), and is
normally used to regulate a secondary winding. Pulling
this pin below 0.8V will force continuous synchronous
operation for the first and optionally the second control-
ler. Do not leave this pin floating.
I
TH1,
I
TH2
(Pins 8, 11):
Error Amplifier Output and Switch-
ing Regulator Compensation Point. Each associated chan-
nels’ current comparator trip point increases with this
control voltage.
SGND (Pin 9):
Small Signal Ground common to both
controllers, must be routed separately from high current
grounds to the common (–) terminals of the C
OUT
capacitors.
3.3V
OUT
(Pin 10):
Output of a linear regulator capable of
supplying 10mA DC with peak currents as high as 50mA.
PGND (Pin 20):
Driver Power Ground. Connects to the
sources of bottom (synchronous) N-channel MOSFETs, an-
odes of the Schottky rectifiers and the (–) terminal(s) of C
IN
.
INTV
CC
(Pin 21):
Output of the Internal 5V Linear Low
Dropout Regulator and the EXTV
CC
Switch. The driver and
control circuits are powered from this voltage source. Must
be decoupled to power ground with a minimum of 4.7
μ
F
tantalum or other low ESR capacitor. The INTV
CC
regulator
standby function is determined by the STBYMD pin.
EXTV
CC
(Pin 22):
External Power Input to an Internal
Switch Connected to INTV
CC
. This switch closes and
supplies V
CC
power, bypassing the internal
low dropout
regulator, whenever EXTV
CC
is higher than 4.7V. See
EXTV
CC
connection in Applications section. Do not exceed
7V on this pin.
BG1, BG2 (Pins 23, 19):
High Current Gate Drives for
Bottom (Synchronous) N-Channel MOSFETs. Voltage
swing at these pins is from ground to INTV
CC
.
V
IN
(Pin 24):
Main Supply Pin. A bypass capacitor should
be tied between this pin and the signal ground pin.
BOOST1, BOOST2 (Pins 25, 18):
Bootstrapped Supplies
to the Top Side Floating Drivers. Capacitors are connected
between the boost and switch pins and Schottky diodes
are tied between the boost and INTV
CC
pins. Voltage swing
at the boost pins is from INTV
CC
to (V
IN
+ INTV
CC
).
SW1, SW2 (Pins 26, 17):
Switch Node Connections to
Inductors. Voltage swing at these pins is from a Schottky
diode (external) voltage drop below ground to V
IN
.
TG1, TG2 (Pins 27, 16):
High Current Gate Drives for Top
N-Channel MOSFETs. These are the outputs of floating
drivers with a voltage swing equal to INTV
CC
– 0.5V
superimposed on the switch node voltage SW.
PIU
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